In exercise of the powers conferred by sub-sections (1) and (2) of section 120 of the Income-tax Act, 1961 (43 of 1961), the Central Board of Direct Taxes hereby (a) directs that the Chief Commissioners specified in column (2) of the Schedule annexed, having their headquarters at the places specified in the corresponding entries in column (3) of the said Schedule, shall exercise their powers and perform their functions in respect of such-territorial areas or of such persons or classes of persons or of such incomes or classes of income or of such cases or classes of cases in respect of which the Commissioners of Income-tax specified in their corresponding entries in column (4) of the said Schedule having jurisdiction vested in them ;

(b) authorises the Chief Commissioners of Income-tax specified in column (2) of the Schedule hereto annexed, or as the case may be, the Commissioners specified in column (4) of the said Schedule, to issue orders in writing for the exercise of the power and performance of the functions by all or any income-tax authorities who are subordinate to them in respect of such territorial areas or of such persons or classes of persons or of such incomes or classes of income or of such cases or classes of cases under their jurisdiction as may be specified in such orders.—